!Note • This PDF catalog is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’s specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our
sales representatives or product engineers before ordering.
R01E.pdf
09.11.4• This PDF catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
What is a Thermistor?
Thermally Sensitive Resistor
Thermistor
Positive Temperature Coefficient
PTC
Negative Temperature Coefficient
NTC
Characteristics of Thermistors
Resistance - Temperature Characteristics
PTC Thermistor
Log
R
(POSISTORr)
BaTiO 3 + X
Ceramics
2xR25
R25
Log
R
25
Curie
Point
NTC Thermistor R25
Mn-Ni, Mn-Co-Cu,
Mn-Ni + X
Ceramics
25 T
T
PRF15/18 Series Chip POSISTORr for Overheat Sensing
PRF15/18 PTC Chip Thermistors detect overheating
of Hybrid ICs, Power Transistors, Power Diodes and
Power ICs etc.
1. 0402 and 0603 light weight
2. High gain simplifies circuit design
3. Free of contact noise and problems
4. Pb free plated terminations
5. Sturdy construction resists mechanical vibration
and shock.
6. PRF18xxx5RB series is available for Reflow/Flow
soldering.
R1
PRF
Thermal
Contact
R2
+Vcc
RL
Fan Motor
M
RE
GND
Thermal
Contact
Power IC
Comparator
PRF
Vref
Example
Control IC
PRF15 Series Characteristics
New
Part Number
PRF15BC471QB1RC
PRF15BB471QB1RC
PRF15BA471QB1RC
Sensing Temperature
(at 4.7k ohm)
(°C)
105 ±5°C
115 ±5°C
125 ±5°C
This product is applied to reflow soldering. This product is recognized by UL.
Dimensions
0.1-0.4
1.0±0.05
0.5±0.05
0.5±0.05
(in mm)
Maximum
Voltage
(V)
32
32
32
Resistance
(at 25°C)
(ohm)
470 ±50%
470 ±50%
470 ±50%
Operating
Temperature Range
(°C)
-20 to 120
-20 to 130
-20 to 140
Electrode
Construction
Cross-sectional
PTC
Ceramics
Nickel Barrier
Sn Plating
